Gas burner



E. H. KAHLERQ I 1,990,736

GAS BURNER Filed July 19, 1933 INVENTOR An important feature of the invention resides head is a o provi ed wi h e lat a eXtendthe walls of which chamber are so formed th t at its large intake en with the usual air reg- 45 form distribution of this secondary air to th lips 18 and 19 of the respective members may be 45 50 As a result of the constructioh of the present, in their justed positio n Order that a y 50 55 action.

Pate ted Feb-.12, 193s ,2 V 1,990,736

vum'l'rzo STATES PATENT OFFICE Edwin H. Kahler, Tauntom assignor to Glcnwood Range Company, Taunton, Mata, a-

corporation of Massachusetts I Application July 19, 1933, Serial No. 681,087

ZChims. (CL 158-117) This invention relates to improvements. in the The above and other features of the invention round or circular typeof gas burners. and novel combination of parts will be herein- Gas burners consisting of.a round or cupafter." described in connection with the accomshaped outer member and a circular centre panying drawing which illustrates one good,- 5 member arranged to provide an annular gas practical form of the invention. 5

discharge slot between the two members have In the drawing: been proposed heretofore, but in these prior Fig. 1 is a top plan view of a round burner constructions the walls of the gaseous chamber constructed in accordance with the present inleading to the gas discharge slot have been provention and secured to a mixing tube. 10 vided with ribs, shoulders or apertures which Fig. 2 on alarger scale is a side view ofthe 10 tend to produce turbulent efl'ects in the gaseous burner of Fig. 1; and

stream delivered to the discharge slot. I 3 is a vertical sectional view through the The present invention contemplates a. round burner of Fig. 2. burner which is so. constructed that the gaseous In the embodiment of the invention shown 15 fuel and the secondary air supplied to support the burner is provided with a cup-shaped head 15 combustion are delivered to the point of comor outer member 10, the upper portion of which ion so as to eliminate as far as possible all flares outwardly as indicated at 11. The head forms of eddy currents and turbulent eirects in 10 has a central hole formed in its bottom and the gas and air streams. this hole is preferably threaded as at 12. The

in a gas burner comprising a cup-shaped head 118 o s 13 av a t a Opening formed having a tubular centre member mounted theretherein and adapted to receive the threaded in so as to provide an annular mixing chamber e d o a mixing t b The mixing tube therebetween having a circular discharge slot, may be of usual c ns u n and is provided they are free from apertures. projections and ulatlng velve irregular surfaces that would produce turbulent W in h cup-shaped hes-d 10 is n d eflects in the gaseous stream. the tubular member 16 the lower'end of which is A more specific feature of the invention rethreaded to engage the threads 12 of the head, to sides in a round burner which is so constructed a d h u p po o o t member 6 flares that the annular walls of the gaseous chamber outwardl as at 17 0V611ie the pp End Of are shaped so that they are curved in an axial the head 10. The arrangement is'such that a direction and converge toward each other in the narrow circular discharge port is formed bedirection of the discharge slot to provide smooth we n the pp nd r l p 18 of th ad and curved walls that will direct the gaseous stream th overhanging lip 19 the tubular member 35 to the discharge slot with a minimum amount The lower of e lip 19 preferably of disturbance. tends somedistance in a horizontal plane as A further feature of the invention resides in Shown to direct the a s m r o w y a round burner which is so constructed that .in a horizontal direction atthe point of i ni- 40 secondary air is supplied to the point of tion. This construction permits the burner to 40 bustion through an in t dly flaring be placed near the bottom of the cooking vessel member of tubular construction, the walls f and prevents the slot from being clogged by which member are formed with a smooth out- P -E i 4 wardly u d surface adapted t eflect a m- The width of the discharge port between the point of t o v varied as desired by turning the interiorl mem- Another feature of the invention. resides in an ber 16 to rotate the threadediower end o this improved means for obtaining a, precise adjusted member Within the threads 12 0f the exterior openin of th discharge port of th n member or head 10. For then locking the parts invention a highly eflicient burnerfis provided, determinat penin f the po t m be mainthe flame of which burns very evenly and causes tained, set screws 20 are provided. These screws thev heat to spread out over the bottom of' a pass through the bottom of the exterior member cooking utensil with a substantially uniior n outside the threaded connection between the two members with head; accessible from outside the burner. The screws tighten against an exterior body flange 21 on the interior member adjacent the threaded connection between the members, and ,on tightening the screws the two members become locked together for maintaining the opening or port between them. Three screws .afre preferably employed, circumferentially aring the width of the port. To avoid the necessity of absolute precision in the threaded connection between the two members this connection may be made a relatively loose threaded connection and thescrews be relied upon to obtain and maintain a precise adjustment in the width of the port opening between the members after said opening ha'sbeen roughly obtained by the threaded connection between them. The screws may, also, be depended upon to cure any difficulty thatmay arise through distortion of the members by heat. I

The construction of the head and tubular member 16 is such that when they are assembled as shown an annular mixing chamber 22 is provided in the lower portion of the head, and the walls leading upwardly from the chamber 22 are curved in an axial direction and converge in the direction of the discharge port as shown.

The upwardly converging walls of the chamber 22, it should be noted, are formed with smooth gradually curved surfaces that are free of apertures, ribs or shoulders that would disturb the gradual flow of the gaseous stream to the discharge port, and these walls blend gradually with the shape of the lips 18 and 19 to form a smooth continuous curve extending to the outer edge of the burner port. Furthermore the shape of the walls and lips just mentioned is preferably such that they converge continuously from the mixing chamber 22 to the outer edge of the port so that the width of the port is less at this outer edge than at any other point. The effect of this is to direct the gaseous mixture to the point of combustion with a high coeflicient of discharge and to steady the flame and prevent it from flashing back.

The inner wall of the tubular member 16 is likewise made smooth and free from ribs or other projections and flares outwardly in an upward direction so that the secondary air that passes up through the lower. end of the member 16 may gradually spread outwardly adjacent the walls of the tubular member as indicated by the arrows. The effect of this is to help keep the burner cool and to cause a uniform distribution of the secondary air beneath the cooking utensil and supply air to the curved portion of the flame. Secondary air moving upwardly around the outer portion of the head 10 as indicated by the arrows is supplied to the lower portion cf the flame.

,formed so that when Adjustment of the inner member 16 so as to provide a narrow discharge port such as shown in Fig. 3 tends to direct the flame outwardly in a horizontal direction, while a wider port adjustment such as shown in Fig. 2 increases the tendency of the flame to curl upwardly as shown in this view. The connection betweenthe lower end of the inner member 16 and the base of the head 10 should be machined or otherwise accurately formed, and the lips 18 and 19 and adjacent walls should likewise be accurately the parts are assembled they will form a smooth discharge port of uniform width around the burner.

It will be understood from the foregoing that the construction of the present burner is such that the primary air and gas supplied by the tube 14 is thoroughly mixed in the chamber 22, that this gaseous mixture is delivered to the discharge port with a minimum amount of turbulent effect, and that .the secondary air passing upwardly through the tubular member 16 is uniformly distributed to the burner. As a result a highly eflicient and steady burning burner is provided that produces a' very uniform heat beneath the cookin'g utensil. Furthermore the smooth inner surface of the tubular member 16 and opening therethrough makes the burner easy to clean to remove grease or food particles that may lodge thereupon.

Having thus fully described my invention, 1 claim and desire to secure by Letters Patent of the United States:---

1. A gas burner comprising an exterior cupshaped member having a central bottom opening and an outwardly flaring upper end portion presenting an out-turned annular lip, an interior tubular member making closed connection with said exterior cup-shaped member around the opening in the bottom thereof and formed with a curved outwardly flaring upper end portion presenting an out-turned annular lip co-operating with said first mentioned lip to form an annular, substantially horizontal, discharge port between them, said members otherwise co-operating with each other to form a mixing chamber between them having smoot stream-lined, walls gradually converging to said annular port, and means through which a gaseous mixture may be delivered to said mixing chamber.

2. A gas burner comprising an exterior cupshaped member having a bottom opening and an upper out-turned annular lip, an interior tubular member'making closed threaded connection with said outer member around the opening in the bottom thereof, said interior member having, also, an exterior body threaded connection and an upper out-turned annular lip, said members co-operating with one another to form a mixing chamber between them with outlet through an annular port between said lips of the respective members, and a number of set screws accessible from outside the burner passed through the bottom of said exterior member outside the threaded connection between said members and adapted to tighten against said flange on the interior member.

EDWIN H. KAHLER.

flange adjacent said 

